Amplify Light Waves Chapter 1

A scientist is studying how a laser affects a piece of metal. Which of the following would be the best evidence to help them track the movement of energy from the laser to the metal?

• • Measuring the distance between the laser and the metal.

• Observing physical changes in the metal, such as an increase in temperature.

• • Counting how many seconds the laser stays powered on.

• • Checking if the room lights are still functioning.

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Why does a person’s skin change color (tan or burn) after spending a day at the beach?

• • The skin is losing its natural particles to the sand.

• • Light from the sun carries energy that causes the skin material to change.

• • The air around the person is pulling energy out of the skin.

• • Light creates a physical layer of "sun color" on top of the skin.

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When a material absorbs energy from light, the energy causes...

• the material to change.

• the light to reflect.

• the light to change.

• the material to give off energy.

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Which country has the highest rate of skin cancer in the world?

• Brazil

• Australia

• Japan

• Egypt

A student places a solar-powered toy under a bright desk lamp, and the toy begins to move. Which statement best explains why this happens?

• The toy is reflecting the light, which pushes it forward.

• • The toy's solar panel absorbs energy from the light, causing the toy to change from still to moving.

• • Light is a physical object that pushes the toy like a hand.

• • The flashlight is pulling energy out of the toy's motor.

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Your friends say that they saw a special nail polish that changes color when it is out in the sun. Can light from the sun cause the nail polish to change color?

• No. Light is not a physical thing, so it cannot change physical things like nail polish.

• Yes. Light from the sun can pull energy out of the nail polish, causing it to change color.

• Yes. The nail polish can take in energy from the light, causing it to change color.

• No. Light can only change things by warming them up, so it cannot cause the nail polish to change color.

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the ability to make things move or change

• energy

• light

• frequency

• wave

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1. If a car sits out in the sun every day for a long time, can light from the sun damage the car’s paint?

• Yes. The paint can take in energy from the light, causing it to be damaged.

• No. Light can only change things by warming them up, so it cannot damage the car’s paint.

• No. Light is not a physical thing, so it cannot change physical things like paint.

• Yes. Light from the sun can pull energy out of the paint, causing it to be damaged.

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In Lesson 1.2, you observed that a solar-powered toy moved when you shined a flashlight on it.

Select ALL of the statements below that accurately explain how this happened.

• Light from the flashlight carried energy.

• There was energy in the toy that was activated by the light.

• Energy from the flashlight was absorbed by the toy.

• The flashlight absorbed energy from the toy.

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A rug sits in a sunny place on the floor for a long time. Kiara thinks that light from the sun can cause the rug’s color to fade over time. Can light from the sun cause the rug’s color to fade?

• No. Light is not a physical thing, so it cannot change physical things like rugs.

• No. Light can only change things by warming them up, so it cannot cause the rug’s color to fade.

• Yes. The rug can take in energy from the light, causing the rug’s color to fade.

• Yes. Light from the sun can pull energy out of the rug, causing the rug's color to fade.